“…The agglomeration of nanoparticles reduces the load-bearing capacity of the composites. 25 The plastic deformation of the composites has begun earlier in the aspect ratio of 1.5 at the stress below 75 MPa, whereasf it started at 150 MPa in the composites of aspect ratio 0.5.…”
The workability study of the composites enhances the understanding of the degree of plastic deformation that can be employed on it. The current research work highlights the response of the low-cost aluminum composites reinforced with exhausted alkaline battery powders under quasi-static compression. The effect of reinforcements and aspect ratio against the strain hardening exponent and strength coefficients were investigated. The microstructural changes after quasi-static compression were studied and related to the changes in the property of the composites. The composite with 6 wt.% of reinforcement showed the least amount of porosity as 1.2%. In most of the cases, the maximum value of average strain hardening exponent with respect to axial strain was noted in the composites with 6 wt. % of reinforcement. The lowest aspect ratio of 0.5 showed the maximum workability in the composites. The average strength coefficient was found to be maximum (308.58 MPa) in the composite with 2 wt.% reinforcement. The elongated grains and slip bands were observed in the microstructure of the compressed specimens.
“…The agglomeration of nanoparticles reduces the load-bearing capacity of the composites. 25 The plastic deformation of the composites has begun earlier in the aspect ratio of 1.5 at the stress below 75 MPa, whereasf it started at 150 MPa in the composites of aspect ratio 0.5.…”
The workability study of the composites enhances the understanding of the degree of plastic deformation that can be employed on it. The current research work highlights the response of the low-cost aluminum composites reinforced with exhausted alkaline battery powders under quasi-static compression. The effect of reinforcements and aspect ratio against the strain hardening exponent and strength coefficients were investigated. The microstructural changes after quasi-static compression were studied and related to the changes in the property of the composites. The composite with 6 wt.% of reinforcement showed the least amount of porosity as 1.2%. In most of the cases, the maximum value of average strain hardening exponent with respect to axial strain was noted in the composites with 6 wt. % of reinforcement. The lowest aspect ratio of 0.5 showed the maximum workability in the composites. The average strength coefficient was found to be maximum (308.58 MPa) in the composite with 2 wt.% reinforcement. The elongated grains and slip bands were observed in the microstructure of the compressed specimens.
“…There is a good interface between GNPs and the aluminium matrix, which imparts good heat transfer between aluminium and GNPs. Figure 4 SEM images of hot extruded GNPs dispersed Al composites with Graphene wt-% are 0.5, 1.0, 1.5, and 2.0. Figure 5 TEM images of interfaces of hot extruded Al composites with (a) Graphene 0.5 wt-%, Graphene 1.0 wt-%, Graphene 1.5 wt-%, and Graphene 2.0 wt-% [20]. …”
Section: Resultsmentioning
confidence: 99%
“…TEM images of interfaces of hot extruded Al composites with (a) Graphene 0.5 wt-%, Graphene 1.0 wt-%, Graphene 1.5 wt-%, and Graphene 2.0 wt-% [20]. …”
Section: Resultsmentioning
confidence: 99%
“…A scanning electron microscope (SEM) (Make: Bruker) with Energy Dispersive Spectroscopy (EDS) analysis is used to determine the morphology and percentage of elements present in the received material. Vignesh Kumar et al [20] have explained the step-by-step procedure of the preparation, heat treatment, and manufacturing of GNP's dispersed aluminium composites. Figure 1 shows the flowchart of the proposed thermal study.…”
The thermal stability and specific heat capacity of Graphene Nanoplatelets (GNPs) dispersed aluminium composites are determined using Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). Results of DSC analysis of the Al/2.0 wt-% GNPs composite show a 174% enhancement in specific heat capacity. Compared to pure aluminium, the Al/2.0 wt-% GNPs composite's TGA results show a 2% mass reduction. Heat transfer characteristics like heat transfer coefficient, fin efficiency, and heat transfer through a fin were determined using a pin-fin heat transfer apparatus under free and forced convection. Compared to pure aluminium, graphene nanoplatelets reinforcement in an aluminium matrix improves the heat transfer characteristics of prepared composites under both free and forced convection.
“…Vignesh et al [19] studied the influence of hot extrusion on grapheme platelets (GNPs) dispersed aluminum composites. The result showed that the strain hardening exponent and strength coefficient values of aluminum composites with 1.5 wt % GNPs dispersion produced by hot extrusion was two times higher than aluminum and non-extruded Al-GNPs composites.…”
The recycling of copper coil into finished products via sand casting with subsequent cold extrusion was investigated. This paper examined the effects of cold extrusion on the mechanical properties of the scrapped copper coil using a locally manufactured extruder with a conventional face die. The mechanical properties tested on the extrudates are limited to hardness, tensile, and compressive strength. The results reveal that the hardness of extruded copper of 11.10 mm and 11.45 mm improved significantly by 39 % and 41 %, respectively, compared with respective non-extruded copper. The compressive and tensile strength increases by 42 % and 22 %, respectively, for 11.10 mm extruded copper compared with the corresponding non-extruded copper. Also, the elongation of the extruded copper of 11.10 mm and 11.45 mm increases by 33 % and 34 %, respectively. It was deduced that the extruded copper is more ductile than the non-extruded copper. The micrograph reveals that grains in non-extruded copper are relatively coarse and nonuniform with voids, but fine and relatively uniform grains are obtained in extruded copper. The grains are refined during cold extrusion, and voids and dislocations are reduced significantly.
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